AN UNINTENTIONAL ROOF FALL WAS DISCOVERED IN #9 ENTRY, SURVEY STATION 7764, 4 LEFT 1 NORTH SECTION. THE FALL WAS APPROX. 18'WIDE X 25'LONG X 8' HIGH. AREA WAS SUPPORTED WITH 6' CONVENTIONAL RO OF BOLTS ON A 4' CENTER PATTERN. ALL APPROACHES SUPPORTED AND DANGERED OFF. IT COULD NOT BE DETERMINED HOW OLD THE FALL WAS AS IT WAS NOT REPORTED TO MINE FOREMAN OR SAFETY DEPARTMENT.